It has been said of Xenophanes that he was the founder of the Eleatic philosophy. And Eudemus, in the Astrological Histories, says that Thales foretold the eclipse of the sun, which took place at the time that the Medians and the Lydians fought, in the reign of Cyaxares the father of Astyages over the Medes, and of Alyattus the son of Crœsus over the Lydians. Herodotus in his first book agrees with him. The date is about the fiftieth Olympiad. Pythagoras is ascertained to have lived in the days of Polycrates the tyrant, about the sixty-second Olympiad. Mnesiphilus is described as a follower of Solon, and was a contemporary of Themistocles. Solon therefore flourished about the forty-sixth Olympiad. For Heraclitus, the son of Bauso, persuaded Melancomas the tyrant to abdicate his sovereignty. He despised the invitation of king Darius to visit the Persians.